If GiveWell decides not to endorse charities focused on existential risk reduction as a general policy, there is little we can do about it. Would you consider an alternative set of criteria if this turns out to be the case?

Yes, I would consider an alternative set of criteria if this turns out to be the case.

I have long felt that GiveWell places too much emphasis on demonstrated impact and believe that in doing so GiveWell may be missing some of the highest expected value opportunities for donors.

It would have been a good idea for you to watch the videos yourself before assuming that XiXiDu's summaries (not actual quotes, despite the quotation marks that surrounded them) were accurate.

I was not sure that XiXiDu's summaries were accurate which is why I added a disclaimer to my original remark. I have edited my original comment accordingly.

I apologize to Eliezer for inadvertantly publicizing a misinterpretation of his views.